Malicious PDF — malware analysis report

Static analysis result for SHA-256 19201583c34dbb4e…

MALICIOUS

PDF

75.2 KB Created: 2021-08-01 19:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 739cf469e1a700e8dc057f7a6b99bf6e SHA-1: 6896b3e25117617bf8302f3b652b8eaf22dc63d5 SHA-256: 19201583c34dbb4ed7e4f01082e8441360d784eaf7bbd71ffb0971ae689f0592
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links, suggesting an attempt to distribute malicious content or conduct phishing operations. The presence of external URIs and link farms strongly suggests an intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://barcelonahotel.vn/UpLoadFile/file/lowinoluvuzamipabaxorerop.pdf In PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/28518b8868100b82332ff26db835bb46/69846281123.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/561078963c9a3a8df53f52ba8ec2381f/87788715063.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/tivezori.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/zifagopog.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/xisuzarugezifutej.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/lopuzidavul.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/4e866dd4e92471819e7a2b88d08d981c/70078076704.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/fgg6udftkd0n2latiteunbbcto/suxuvubo.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/68549092007.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c1d6e8c11---68997941962.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/timapam.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021070703495229.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e40e792c46---nuzolomovomorixojoko.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8abe09aaeaf4d48553b9c27c8360f25a/60503317440.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/2890602c738c204d063b3e3906a47bca/koxazegag.pdfIn PDF document text
    • http://fedoro.ru/upload/file/garozanak.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/84adde738d50390940f1fe710526c2e5/26328271205.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/47631263654.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac40d181ee8---fixavusukukegijinopureki.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/kozerafop.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/42548882502.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a421622d1af---libukebaxigenakobutejizi.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/gafojutubitekabimed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=collocations+exercises+with+answers+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 16684 bytes
SHA-256: e2f7109cbcca2da5c01677c9aad809bccaddf87d273594a12d68e585f74ede62
font_02_sfnt_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 10936 bytes
SHA-256: e87650afee4660ac70bb0fb962d1fdb193f79b20572e0ab177d9117d979dfbe4

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